Improve planner stats documentation

It was pointed out that in the planner stats documentation under
Extended Statistics, one of the sentences was a bit awkward.  Improve
that by rewording it slightly.

Discussion: https://postgr.es/m/154409976780.14137.2785644488950047100@wrigleys.postgresql.org

diff --git a/doc/src/sgml/perform.sgml b/doc/src/sgml/perform.sgml
index e1e65c057e007f2b9c536827e2795b5c4ada6ac1..4dd3e35d0e5bf0ca72199c69c0d939576e443c8d 100644 (file)
--- a/doc/src/sgml/perform.sgml
+++ b/doc/src/sgml/perform.sgml
@@ -1086,8 +1086,8 @@ WHERE tablename = 'road';
    
 
    
-    Statistics objects are created using
-    , which see for more details.
+    Statistics objects are created using the
+     command.
     Creation of such an object merely creates a catalog entry expressing
     interest in the statistics.  Actual data collection is performed
     by ANALYZE (either a manual command, or background